unnecessary code in _make_one_branch of HRModule

Code from 96 to 97  is "self.in_channels[branch_index] = \ num_channels[branch_index] * block.expansion"
this code is unnecessary because self.in_channels[branch_index] has assignment in line 343。
Line343: “self.in_channels[branch_index] = num_channels[branch_index] * block.expansion ”